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Both Vokoun (35) and Bryzgalov (31) have had excellent regular-season careers, as their numbers demonstrate.
Vokoun has posted a 262-267-76 record with a 2.56 GAA and a SV% of 0.917.
Bryzgalov, on the other hand, boasts a 151-116-35 record with a 2.53 GAA and 0.916 SV%.
With both goaltenders putting up virtually identical GAAs and SV%s, the only factors left to consider are the number of games played and the quality of the team in front of the goaltender.
In terms of games played, Vokoun has nearly twice the number of games played (632 to 326) as Bryzgalov, despite being only four years older. Even if Bryzgalov were to average 60 regular-season games played (a reasonable assumption) for the next four seasons, he'd still be nearly 80 games short of Vokoun's current total. Any way you slice it, that's a lot of additional wear and tear on Vokoun's tires.
In terms of the quality of the team in front of each netminder, its fair to say that Bryzgalov has had the advantage, but not by as much as one might think. Few remember, but the Predators were a solid team from 2005-2008, with 106, 110, and 91 point seasons in those three years (the final season without Vokoun). Even the Panthers were a decent team for Vokoun's first two seasons in Florida, posting 85 and 91 points, respectively. After that, well, things fell apart in the Sunshine State. But it wasn't always bad.
Bryzgalov certainly enjoyed a much nicer situation in Anaheim, where he was the backup to then-good J.S. Giguere on a team with players like Scott Niedermayer, Chris Pronger, Ryan Getzlaf, etc. Goaltenders have played in worse situations. In Phoenix, Byrzgalov received his first real taste of life without two sure-fire Hall of Famers on his blueline, and performed fairly well given the situation. During his last two seasons, Bryzgalov has the most wins of any NHL netminder and has emerged as a consensus top-10 goaltender in the league (during that span).
Vokoun has a slightly better SV% and has played on some fairly bad teams, but we must not discount his time in Nashville, when he too played behind future Hall of Famers (Peter Forsberg, Paul Kariya, etc) and All-Star defenseman (Kimmo Timonen, Shea Weber, Ryan Suter, Dan Hamhuis).